New York City Subway Investigation

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*Whether a train is considered on-time is here measured using Wait Assessment. Wait Assessment is a percentage statistic detailing the number of trains that are "on time," where "on time" means arriving within 25% of their scheduled arrival. For example, if Train A arrives, and Train B is scheduled to arrive 8 minutes later, then Train B is successfully on time if it arrives within 10 minutes.

The line of best fit is a simple linear regression. It is meant to convey the general trend of a subway line over the time period, and is probably not predictive.